TESY HPWH 2.1 200/260 U02 Instructions D'installation Et De Maintenance page 27

WARNING! The tripping of the safety thermostat can be caused by a fault linked to the control
board or by the absence of water inside the tank.
WARNING! Carrying out repair operations on parts that perform safety functions jeopardises the
safe operation of the equipment. Substitute the faulty elements only with original spare parts.
N.B.: The intervention of the thermostat excludes the operation of the electric heating elements but
not the heat pump system within the permitted operating limits.
Thermal protections
First step protection: when the tank water goes up to 85°C, the unit will stop and the relating error
code will be shown on the controller. This is an auto-reset protection. When tank water temperature
goes down, the unit can start again.
Second step protection: when the tank water keeps going up and reaches 90°C, the manual reset
cut-off will be active, the electrical heater stops, unless you manual reset the protector.
10.2. Quarterly inspections
•
Visual inspection of the general conditions of the equipment systems as well as the absence of leaks;
•
Inspection of the ventilation filter, if present
10.3. Annual inspections
•
Inspection of the tightness of bolts, nuts, flanges and water supply connections that may have been loosened by
vibration;
•
Check the state of integrity of the magnesium anodes (see paragraph 10.4).
10.4. Magnesium anodes 18. (Fig.14)
The magnesium anode (Mg), also called "sacrificial" anode, avoids any parasitic currents that are generated inside
the boiler that can trigger corrosion processes on the device surface.
In fact, magnesium is a metal with a lower electrochemical potential when compared to the material that lines the
inside of the boiler, therefore it first attracts the negative charges that form with the heating of the water and that cause it to
corrode. Therefore, the anode "sacrifices" itself by corroding instead of the tank.
The integrity of the magnesium anodes must be checked at least every two years (even better if checked on an
annual basis). The operation must be carried out by qualified personnel. Before performing the inspection, it is necessary to:
•
Empty the water from the boiler (see paragraph 10.5);
•
Unscrew the upper anode and check its state of corrosion, if more than 30% of the anode surface is corroded then it
is necessary to replace it;
The anodes have appropriate sealing gaskets, in order to avoid causing water leaks, it is recommended to use anaerobic
sealant for threads compatible for use on sanitary and heating systems. The gaskets must be substituted both in case of
inspection as well as the replacement of anodes with new gaskets
Fig. 14
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